The Generic Thief
Two major ways to play thief:
1. Burst them down
2. Outlast them (bleed/condition)
The former you’ve found although I disagree in the strength of all the skills you did not mention. They all have a place. Dancing dagger, cloak and dagger, Choking Gas, Disabling shot all have situational uses. Using them appropriately allows engagement, disengagement, and weakening/control over your opponent.
These skills become more important in as your oppenents are more able to withstand straight up damage and truly come into their own in a more bunker type build.
See the above for Shortbow usage, might also want to watch Wild Bill P/D below to see a pretty nifty stealth-bleed spamming build.
http://www.youtube.com/watch?v=xnqE7xnqsyI
So you’re saying that although a thief may use a generic build, utilities and how to use various weapon skill ultimately define the good thieves from the bad thieves?